January 1, 2023

A pig liver that has been "decelled" is held by a technician in a Micromatrix laboratory on Tuesday, Dec. 8, 2022, in Eden Prairie, Minn. The first step for workers in this suburban Minneapolis lab is to shampoo away the pig cells that made the organ do its work, its color gradually fading as the cells dissolve and are flushed out. What’s left is a rubbery scaffolding, a honeycomb structure of the liver, its blood vessels now empty. (AP Photo/Andy Clayton-King)